Reel for tightening filaments



FIG. 1 is a top plan view of a reel for tightening filaments showing my new design;

FIG. 2 is a right end view thereof;

FIG. 3 is a left end view thereof;

FIG. 4 is a perspective view looking towards the right end view of FIG. 2;

FIG. 5 is a perspective view looking towards the left end view of FIG. 3. 

The ornamental design for a reel for tightening filaments, as shown. 